What is the name of the base table which stores the flag which states if the Account under your user

I'v been asked to create a report to find the Primary Account of each user in iStore. I'm looking for the table which stores this information, thanks.

Ability to switch accounts: When a user access the Customer Application, the primary account number is set into the cookie. If the user hasn't defined the primary account, the first created account is used. An account switcher, located in the Welcome Bin on the Site Home Page, allows B2B users to switch to a different account assigned to them within their organization. Note that only the account number will display, not the account description. When the user switches accounts, the new value is set again into the cookie. Oracle iStore reloads the page, and the user sees only information (carts, orders, etc.) related